Operating Instructions RF-2000
70
water before replacing the liquid.
8.2 Checking the Xenon Lamp
8.2.1 Note in moving this instrument
Important:
When moving this instrument, be sure to remove the xenon
lamp and put it in the protective case for the xenon lamp. Pay
special attention in handling a xenon lamp since a small
explosion is occurred by high pressure charged in the xenon
lamp when it is destroyed by an impact. If you touched the
xenon lamp valve by hand, clean it with ethyl alcohol before
lighting.
8.2.2 Service life of xenon lamp
A xenon lamp is consumable. Luminescence point of the lamp may move around or
the lamp may flicker in the course of time. When these phenomena occur, noises in
the baseline become extremely large and measurement is not performed accurately.
Important:
Xenon lamp used for a long time (1000 hours or more) is
dangerous since it may explode. Replace the lamp after using
for the ensured hours (500 hours).
Check the flickering of the lamp according to the following procedure:
(1) Connect a pen recorder to the recorder terminal at the rear of this unit.
(2) Fill distilled water in the flow cell using the provided syringe.
Make sure that no air bubble is there in the flow cell.
(3) Turn on the power of the recorder, and adjust the zero point to zero
accurately.
(4) Set the parameters as follows.
EX : 350nm
EM : 500nm
RANGE : 7 (x64)
SENS : 3 (LOW)
RESPONSE : 2 (0. 5s)
GAlN : 3 (x16)
RATIO : 1 (fixed)
Z WAVE : 1
(5) Press the ZERO key of the RF-2000 to adjust the zero point.
(6) Move the emission wavelength at around 350nm so that the displayed value
for data becomes around 700 ~ 800.
(7) Set the range so that the recorder pen varies in the range of 50 ~ 100 scales.
(8) Set the recorder chart speed to about 10mm/min and record for about 30
minutes.
(9) After completing recording, calculate the noise ratio as shown in the figure.
If the noise ratio is 5% or more, the lamp is at the end of its service life.
Replace it with a new one.
To Next Page
Loading...
